Bacteria cells have a cell wall which is a rigid outer layer that surrounds the cell membrane. This cell wall provides structural support and protection for the cell. The type of coating on a bacterial cell depends on its Gram stain reaction.

Here's the breakdown:

* Gram-positive bacteria: These bacteria have a thick layer of peptidoglycan (a complex sugar-protein polymer) as their primary cell wall component. They also have a smaller amount of other components like teichoic acids.

* Gram-negative bacteria: These bacteria have a thinner layer of peptidoglycan and an outer membrane composed of lipopolysaccharides (LPS), phospholipids, and proteins.

In summary:

* Gram-positive bacteria: Thick peptidoglycan layer

* Gram-negative bacteria: Thin peptidoglycan layer and an outer membrane

The specific composition of the cell wall can vary depending on the species of bacteria.